Spin, charge, and orbital fluctuations in a multiorbital Mott insulator
Spin, charge, and orbital fluctuations in a multiorbital Mott insulator
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DOI：
10.1103/physrevb.72.045128
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发表时间：
2005-03
影响因子：
3.7
通讯作者：
A. Koga;N. Kawakami;T. M. Rice;M. Sigrist
中科院分区：
文献类型：
--
作者：
A. Koga;N. Kawakami;T. M. Rice;M. Sigrist
结合动力学平均场理论和量子蒙特卡罗模拟，研究了具有不同跳变积分的双轨道简并hubbard模型。通过考察自旋、电荷和轨道磁化率的温度依赖性以及单粒子谱函数，阐明了轨道波动对莫特跃迁性质的作用。我们还考虑了两个轨道间杂化的影响，这在接近Motttransition点时尤为重要。杂化的引入引起轨道波动，导致类似近藤的重费米子行为的形成，类似于f电子系统，但涉及的电子带宽度相当。
Theoretische Physik, ETH-H¨onggerberg, 8093 Zu¨rich, Switzerland(Dated: February 2, 2008)The two-orbital degenerate Hubbardmodel with distinct hopping integrals is studied by combiningdynamical mean-field theory with quantum Monte Carlo simulations. The role of orbital fluctuationsfor the nature of the Mott transition is elucidated by examining the temperature dependence of spin,charge and orbital susceptibilities as well as the one-particle spectral function. We also consider theeffect of the hybridization between the two orbitals, which is important particularly close to the Motttransition points. The introduction of the hybridization induces orbital fluctuations, resulting in theformation of a Kondo-like heavy-fermion behavior, similarly to f electron systems, but involvingelectrons in bands of comparable width.